Also side note but on my new m3 I can confirm Bosch icon xt fit right out of the box no swapping adapters or cutting needed, needs to be the xt variant tho.
I replaced my fuel filter/regulator with a new one from Bosch, and the little rubber fuel injection hoses connected to it.
After I cycled ignition like 5 times to build fuel pressure it started to make this sound.
Struggled a bit after starting it but after 20 seconds settled and it now drives good.
Car feels solid no lack of power or nothing.
I dare to say it even drives better than before.
I have a N55, e93 And went through the same back and forth between NGK and Bosch. My car is 100% stock. Ordered ZR5TPP33 Spark Plug - Bosch and the car runs just fine.
My F15 had the Bosch ZR5TPP33-S from the factory. I replaced with ZR5TPP33 when doing the valve cover about 20K miles ago, and no problems so far.
I have Blizzaks on my AWD BMWs right now, and it makes a huge difference.
But in europe its best to get early b25 (85-87) pistons for higher compression(9.75.1), late model pistons (8.8.1) work fine aswell but just a little bit lower compression so a little bit lower performance.
Front fog lights are dazzling in the rain because they reflect off the wet road surface, so it's annoying then, but front fogs don't really bother me if it's dry.
I would look at pads. Akebono which are a low dust pad act like what you are experiancing. Not a lot of inital bite. Which I like.
The high pressure fuel pump can also go out commonly.
The cooling system is the major weak point (ask me how I know) - water pump failed before 70k (changed under warranty)
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